Duplex grinding-mill.



No. 640,845, Patented lan. 9, |900.

E. H. WEBSTER.l

DUPLEX GRINDING MILL.

' (Application led Mat. 12, 189B.)

(No Model.) 4 Sheets$heat l.

' Il YUV/5.8187115' /N V E N TOR Patented lan. 9, |900.

E. H. WEBSTER.

DUPLEX GRINDING MILL.

(Application Bled Mar. 12, 189B.)

4 Sheets--Sheet 2.

(No Mode.)

im mmf v Patented lan. 9, |900.

E. H. WEBSTER.

DUPLEX GRINDING MILL.

(Application med Maf. 12, isos.)

4 Sheets-Sheet v3.

(No Model.)

' [N VE N TOR v 1 Al/ormjy I Patented lan. 9, |900.

E. H; WEBSTER.

DUPLEX GRINDING MILL.

(Application led Mar. 12, 1898.)

4 Sheng-Sheet` 4.

(No Model.)

` UNITED STATES PATENT OFFICE.

*EDWARD H. WEBSTER, oF RUTLAND, VERMONT, AssIGNoR To THE HoWE SCALECOMPANY OF 1886 OF SAME PLACE.

D u FLEX-em Nome-...M1 LL.

SPEIFICATION forming" part of Letters PatentNo. 640,845, dated January9, 19.00. Y 'i Application filed March-12, 1898. Serial No. 673,602. (Nomodel.)

To all whom it may concern..-

Be it known that I, EDWARD H. WEBSTER, a citizen of the United States,residing at Rutland, in the county of Rutland and State of Vermont, haveinvented certain new and use-` ful Improvements in DuplexGrinding-Mills;

. and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates toimprovements in a duplex grinding-mill and adjustmeuts therefor for grinding codec, spices, &c.

An object of the invention is to provide a duplex colfee-mill which issimple in construction, strong and durable, positive ofaction,

and e'conomical in the use of power. Y

A further object is to provide such a mill so that by one adjustment themill will grind any material-such as coifee, ire-either as a fine powderor granulate the same, depend# ing upon to which chute 'the material isadmitted from a common receptacle.

A further object is to provide certain novel adjustments for thegrinding-plates and other minor details, which will be more fullypointed out in the specification and claims.

Reference is to'be had to the accompanying drawings for a clear andcomplete understanding of the invention, in which- Figure lis a generalperspective view of the mill in position for operation. Fig. 2 is acentral transverse sectional viewA of the same. Fig. 3 is an end view ofthe mill, the upper part being shown in section for better illustration.Fig. 4 is a perspective view of a 'part of the mill, theother part beingbroken away for clearer illustration, showing the adjustment device andindicator on the same to set the adjustment. Fig. 5 represents graphitebearings used on the shaft of the device.v

Fig. 6 are views of a hopper-valve and securing device for the same.Fig. 7 are front and rear views ofthe revolving or rotary insidegrinders, and Fig. 8 is'l an inside view of a stationary grinder-platein and against which a rotary grinder operates.

In the drawings, A represents an upright standard suitablysecured to-the door by a base a to steady the'mill and prevent vibration whilerunning. Only one standard is shown but for larger mills anotherstandard may be used when necessary. This standard is tubular and has asuitable collar at its u pper end, in which is a set-screw a', by meansof which a vsecond standard A'is adjusted and held at any desiredelevation within the first standard. This second standard A'v hassecured in a plane at right angles to it one end of au elliptical-shapedyoke B by means of a set-screw b', as shown, there being a sleeve bformed on said yoke for the insertion of the upper end of standard A'.Secured to the inside of this yoke are oppositely-arranged dependinghangers c, and bolted or otherwise secured to the latter areoutwardly-projecting seats C C' for the support of receptacles toreceive the ground material from the de- .livery-spouts of .the mill.

Bolted to the middle portions of the exteriors of yoke B are the lowerinterior sides of the grinder-casings D D', which are of cylindricalform, and these interior sides are centrally provided withinwardly-projecting journal-bearings d d for a shaft to project through,as hereinafter described, and one of these bearings d' has its exteriorsurface threaded. (See Fig. 2.) The fronts or exterior sides of thesecasings are provided with doors E E', suitably hinged 4at e atcorresponding points on the exterior surfaces, and the opposite sides ofthe doors are provided with suitable securing devices, such asa slotftedprojection e' onthe doors and a pivoted bolt e2 to engage the same,having a wing-nut es upon its outer end, said bolt being threaded andsecured to the side of the casing, as shown. L The central portions c4of said doors project outwardly, forming osets upon their interiorsurfaces, in which'stationary grinding-plates are secured,hereiuafterreferred to.

F F' are two chutes leading from an upper and common valve H tothe upperends of casings E and E', respectively, with which they communicate, andthe lower ends of these chutes are. bolted to the upper interior sidesof the casings at f f to hold the parts securely in place. On the chutesF F are also four lugs, through which the bolts i pass, securing themill to 'the counter J and supporting the mill. At the upper ends ofthese chutes at the point of jointure there is provided a snitablevalve-seat G, in which there is mounted shaft next thereto.

a valve H, (see Fig. 6,) which is partly cut away at h and has atransverse groove h' in there maining portion, into which projects theupper end of a screw g' from the under side of the valve-seat to limitthe play of the same, and this valve has upon one of its ends a seriesof apertures h2, into .which a pin h3 upon the end of a spring-rod h4,secured to one of the chutes, is forced to hold the valve in any desiredposition, the chute being cut away opposite this end of the valve forvthat purpose.

I is a dome or hood which fits-over the top of the chutes and has a central opening registeri ng therewith, and this dome rests on the counter.or platform J, as shown, its weight being sufficient to hold it inplace. In the upper end i' of this dome is removably tted or inserted ahopper K of any approved design to receive the coffee or other substanceto be ground.

L is the driving or power shaft, of less length than the distance fromdoor E to E', which passes through journals d d' and suitable bearings ll' in the interiors of the journals. Upon the center of this shaft issecurely mountedY to revolve therewith a driving-wheel M, and the hub mof this wheel has a suitable graphite washer m' on its yside towardcasing D' for the abutment of adjuster N, mounted on the y This adjusteris thimbleshaped and threaded on its interior surface n and screws ontothe threaded surface on journal d', before referred to, and the endthereof n is apertu red to receive the shaft L. Secured to said shaft ata short distance from the end' of journal d is a collar O, which ispreferably held rigid on the shaft by a screw o, passing through thecollar and into a recess in said shaft. When the adjuster N is turned orrotated upon the threads of the journal d', it shifts the shaftLlongitudinally to the right or the left, according to the movement ofthe adjuster, and the displacement may be accomplished with precisionand the shaft retained in its shifted position by means of the mechanismcoperating with said adjuster. The collar 0 and hub m being fixtures onthe shaft and the adjuster being free from the rotatory influencethereof, the turning of .the said adjuster imparts only the desiredlongitudinal movement to the shaft. To reduce the friction incident tothe contact of the colar Q with the adjuster, theformer isv recessed atintervals o2 and provided with fillings of some suitable substance, suchas graphite. This adjuster has a cogged outer rim n2 and a series ofnumerals n opposite said cogs Vto designate the same, as shown.

a4 is a suitable indicator-nger secured to the inner side of casing D'above said cogs and numerals na. 'a5 is a Weighted lever centrallypivoted .to the same casing, having. an upper end suitable to engage andhold said cogged surface from revolving byA means of a `weight n on itslower end. The ends of shaft L are preferably turned down and haveapertures through the same. Upon these ends are secured the rotarygrinders P by means of slots l2 in the backs thereof and pins l' in saidslots passing through said apertures,vv

which hold the rotary grinders securely lou said shaft to revolvetherewith.V These rotary grinders are preferably made up of a circularcasting P1for a base, which is cenl trally apcrtured to fit VVsnuglyupon the ends of shaft L, and thesecastings P have een trally-locatednubs or projections p', which are of truncated-cone shape, v`as shown.Screwed to these bases by screws p'f are the grinders proper ofsubstantially dish shape and designed to lit over the cone-shaped nnb.and he secured, as described. The truncated cone p3 of the 'rotarygrinder has suitable grooves and sharpened edges upon its outer surface,as shown, and to make the grinder more secure a screw p2 is passedthrough its lhead and screws into the end of shaft L. The faces p5 ofthe rotary grinders have next to the cones psa series of teeth p4 andnearer the rims thereof are grooved finely, as at p5,

tionary grinders are apertured at q2, cen-- trally of the same, and arethereby screwed to the doors E E by screws g8, as shown, and q". arescrews passing through the lower parts of doors E E and bearing againstthe lower parts of the stationary grinders for the purpose of adjustingthe same with respect to the rotary grinders. Ou account of thisconstruction the grinders may at any time be removed and otherssubstituted, and it is further apparent that when one of the rotarygrinders is adjusted to grind lfinely by l OQ manipulating the adjuster,as before described, the other rotary grinder will be farther andcorrespondingly withd rawn from its adjacent stationary grinder, softhatone part of the mill will grind finely while the other part `or set ofgrinders will 'grind coarsely or cause granulations, provided the Vcodecor other material is admitted at the same time to both sets of grinders.This is especially advantageous for iilling two orders at the 'same timefor finely-grouud and granulated material. Besides it is a saving inpower and is economical, inasmuchas one mill serves the purposes oftwomills.

The upper conical partsor the depressions' 'Q' are cut away at g5'(see,Figst 2 and 8)'in alinement with chutes F F to readily admit thematerial to be ground directly upon the .d2 d2 of the casings intosuitable receptacles C C below.

- The material to be ground after having been placed in hopper K isadmitted, alternately `when desired, first into chute F and then intochute F by valve H, which is operated by means of a suitable rod R,secured at its inner end to a projection r of said valve, thencesupported in suitable guideway on dome I, and having a handle r on itsouter end for manipulating the same.

Power is applied to wheel M in any desired method for operating themill.

'Having thus described my invention, what I claim, and desire to secureby Letters Pata hopper, and a forked two-way chute leading therefrom, ofa one-way rotary valve, seated in the angle of the chute, to direct thecontents of the hopper to either branch of the chute, a pin engagingwith a groove in the surface of the valve to limit the rotary movement,a spring-pressed pin adapted to engage with a series of holes in theend'of the valve to lock the same in a desired position, of a rotatableshaft, a grinding-disk secured to each end of theshaft to rotatetherewith, stationary grinding-disks located in juxtaposition to thesaid rotary grinding-disks and means for shifting said shaftlongitudinally ineither direction to simultaneously vary the spacebetween the faces ofthe two sets of grinding-disks, consisting of asleeve loosely mounted on said shaft, between the sets of disks, withone end threaded upon an eXtension of the support for the stationarydisks, a ratchet-and-pawl arrangement to secure the sleeve in a fixedposition and means for preventing longitudinal movement of the shaftindependently of the sleeve pockets or chutes on the rear of thestationary grinding-disks leading to the central openings in said disks,and opening into said two-way chute, substantially as described and setforth.

In testimony whereof I affix my signature in presence of two witnesses.

